ISDN2/ISDN30 – Digital lines. ISDN2 can carry up to 2 concurrent calls, ISDN30 can carry between 8-30 calls. End of life and being turned off by BT in 2025.
SIP: Session Initiation Protocol, the replacement of ISDN. There are voice lines that come through an internet connection. Can be at least 60% cheaper than ISDN, but are reliant on the quality of the internet. Good internet means good call quality. There are specific internet connections that will guarantee good quality calls in poor internet areas.
For more information on our services or to get a quote, please contact us on 08707 740 771 or fill out the form